Leveling speed 80-85 in MoP

Hey,
i was wondering, since we have some changes in the level range 80-85, like new heirlooms and lowered xp needed, whats the leveling speed now?
How much hours do you think i will need to go from 80-85?
And is it better to do quests or run the cata instances?

I think in general questing is faster than instances. As long as you are a proper quester and no one else is around. I managed to beat the 5 man speed team to level 86 when MoP came out on quests alone.

The answer to that will mostly depend on how quickly you can get through the Cata zones normally. I recently did a number of runs through Cata quests to level up a series of alts to 85. With full heirlooms, no rest state, and leveling in pairs I was 82 about 3/4 through Hyjal, just short of 84 after completing all quests in Deepholm (opening the portal to Uldum or Therazane dailies bumped it up to 84), and 85 about 1/3 of the way through Twilight Highlands. (I prefer these zones because they tend to have much better organized quest hubs for quicker questing)

So for me, I would say I spent about 8-10 hours with each pair. With a rest state and working alone cut that to about 6-8 hours I think. And I never found Cataclysm instances to be particularly efficient. While not as brutal as the heroic modes, they're still filled with mechanics pugs can struggle with. Not to mention Cata is the expansion that experience pool totals start making exponential increases, so it definitely doesn't seem to be anywhere near as fast as a dedicated quest grind.

When the 85 hierlooms come out, itll be extremely fast, about an hour per lvl. ATM, i tend to do maybe 40 quests per zone before moving to the next (Thats quite a bit under half for most zones, compared to original).

Anyone ever notice how the sun seems to shine silverish now? Didn't it used to shine goldish? PM me if you've noticed this.

If ur tank or healer 1-3 hours fully loomed. with instances : ) if dps do some questing while in que, que for spesific so u get to the instance with new quests always ^_^ 1-5 hours played max

No fekking way..

Instance levelling is PAINFULLY slow.
My 86 tankadin haven't left Orgrimmar since he was level 20ish (except for a few trips to odd vendors), and from my 9 toon at level 83+ he was BY FAR the slowest to level.
It's most likely 2-3 times as slow to level in dungeons as questing...